// Copyright 2007, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of Google Inc. nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Sets up google.gears.*, which is *the only* supported way to access Gears.
//
// Circumvent this file at your own risk!
//
// In the future, Gears may automatically define google.gears.* without this
// file. Gears may use these objects to transparently fix bugs and compatibility
// issues. Applications that use the code below will continue to work seamlessly
// when that happens.

(function() {
    // We are already defined. Hooray!
    if (window.google && google.gears) {
        return;
    }

    var factory = null;

    // Firefox
    if (typeof GearsFactory != 'undefined') {
        factory = new GearsFactory();
    } else {
        // IE
        try {
            factory = new ActiveXObject('Gears.Factory');
            // privateSetGlobalObject is only required and supported on WinCE.
            if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
                factory.privateSetGlobalObject(this);
            }
        } catch (e) {
            // Safari
            if ((typeof navigator.mimeTypes != 'undefined')
           && navigator.mimeTypes["application/x-googlegears"]) {
                factory = document.createElement("object");
                factory.style.display = "none";
                factory.width = 0;
                factory.height = 0;
                factory.type = "application/x-googlegears";
                document.documentElement.appendChild(factory);
            }
        }
    }

    // *Do not* define any objects if Gears is not installed. This mimics the
    // behavior of Gears defining the objects in the future.
    if (!factory) {
        return;
    }

    // Now set up the objects, being careful not to overwrite anything.
    //
    // Note: In Internet Explorer for Windows Mobile, you can't add properties to
    // the window object. However, global objects are automatically added as
    // properties of the window object in all browsers.
    if (!window.google) {
        google = {};
    }

    if (!google.gears) {
        google.gears = { factory: factory };
    }
})();
